<template>
  <div>
    <!-- 无id时, 可以使用index(反正也是就地更新) -->
    <div style="display:inline-block" v-for="(item,index) in arr" :key="index">
      <input type="checkbox" :value="item" v-model="hobby" />
      <span>{{item}}</span>
    </div>
    <p>你选中的元素, 累加的值和为:{{sum()}}</p>
    <p>你选中的元素, 累加的值和(计算属性):{{sums}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      hobby: [],
    };
  },
  methods: {
    sum(){
    return this.hobby.reduce((prev,item)=>prev+item,0)
    }
  },
  computed: {
    sums() {
      return this.hobby.reduce((prev, item) => prev + item, 0);
    },
  },
};
</script>

<style>
</style>